scholarly journals Efficient numerical modelling of time-domain light propagation in curved 3D absorbing and scattering media with finite differences

2021 ◽  
Vol 12 (3) ◽  
pp. 1422
Author(s):  
Anthony Allali ◽  
Alexander D. Klose ◽  
Yves Bérubé-Lauzière
Keyword(s):  
Numerical Modelling ◽  
Time Domain ◽  
Finite Differences ◽  
Light Propagation ◽  
Scattering Media

scholarly journals OAM light propagation through tissue

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Netanel Biton ◽  
Judy Kupferman ◽  
Shlomi Arnon
Keyword(s):  
Light Propagation ◽  
Biological Imaging ◽  
Gaussian Beams ◽  
Medical Implants ◽  
Optical Wireless ◽  
Scattering Media ◽  
Valuable Contribution ◽  
Light Beams ◽  
First Time ◽  
Diffuse Media

AbstractA major challenge in use of the optical spectrum for communication and imaging applications is the scattering of light as it passes through diffuse media. Recent studies indicate that light beams with orbital angular momentum (OAM) can penetrate deeper through diffuse media than simple Gaussian beams. To the best knowledge of the authors, in this paper we describe for the first time an experiment examining transmission of OAM beams through biological tissue with thickness of up to a few centimeters, and for OAM modes reaching up to 20. Our results indicate that OAM beams do indeed show a higher transmittance relative to Gaussian beams, and that the greater the OAM, the higher the transmittance also up to 20, Our results extend measured results to highly multi scattering media and indicate that at 2.6 cm tissue thickness for OAM of order 20, we measure nearly 30% more power in comparison to a Gaussian beam. In addition, we develop a mathematical model describing the improved permeability. This work shows that OAM beams can be a valuable contribution to optical wireless communication (OWC) for medical implants, optical biological imaging, as well as recent innovative applications of medical diagnosis.

scholarly journals Exciters of scalar modes of a circular waveguide.

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
V.A. Kaloshin ◽  
◽  
Van Chung Pham ◽  
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Finite Differences ◽  
Circular Waveguide ◽  
Optimization Of Parameters ◽  
Simulation And Optimization ◽  
Metal Waveguide

Various options for constructing broadband exciters ТМ01and ТЕ01 modes of a circular metal waveguide have been proposed and investigated. Electrodynamic simulation and optimization of parameters were carried out using finite element and finite differences in time domain methods.

scholarly journals Numerical Modelling of Poroviscoelastic Grounds in the Time Domain Using a Parallel Approach

2006 ◽  
pp. 50-57 ◽  
Author(s):  
Arnaud Mesgouez ◽  
Gaëlle Lefeuve-Mesgouez ◽  
André Chambarel ◽  
Dominique Fougère
Keyword(s):  
Numerical Modelling ◽  
Time Domain ◽  
The Time Domain

scholarly journals Vector transmission matrix for the polarization behavior of light propagation in highly scattering media

2012 ◽  
Vol 20 (14) ◽  
pp. 16067 ◽  
Author(s):  
Santosh Tripathi ◽  
Richard Paxman ◽  
Thomas Bifano ◽  
Kimani C. Toussaint
Keyword(s):  
Light Propagation ◽  
Transmission Matrix ◽  
Scattering Media ◽  
Vector Transmission ◽  
Polarization Behavior

scholarly journals Precision of extracting absorption profiles from weakly scattering media with spectroscopic time-domain optical coherence tomography

2004 ◽  
Vol 12 (8) ◽  
pp. 1677 ◽  
Author(s):  
B. Hermann ◽  
K. Bizheva ◽  
A. Unterhuber ◽  
B. Povazay ◽  
H. Sattmann ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Time Domain ◽  
Optical Coherence ◽  
Scattering Media
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